D. c. railway system



July 30, 1929. u. KLOSS 1,722,582

n. c. RAILWAY SYSTBI Filed larch 22, 1928 ULRICH KLOSS Patented July 30, 1929.

utnr'cn: gross, on

J ,ATENT OFFICEJ? I n. c. RAIL AY SYSTEM.

Application filed. March 22, .1923, Serial No. 263,729, and in Germany June 14,1927.

iThis- -invention relates to electric railway systems, and is 'applicableto-all systems in which a vehicle is propelled electrically over railsand in which the track, as regards the supply of current, is divided into-zones or sections which are each supplied with current separately. Theflterm railway--is accordingly intended to apply in its broader sense to also cover. other railsystems, such as tramway systems, although. for better-comprehenrsion the inventionwill ,-be described with reference to a railway? v in ,its usually accepted meaning. 1-:

- More particularly, the invention relates to a method of disconnecting. at a distance a certain zone or zonesin the caseof D. C.

. railway systems, that is to say depriving such zone or, zones of;current. This disconnection may be performed eitherfrom the train itself or from the blocksections. In case of danger,

for example afireon the-train, it is necessary to switch off, thcyoltage on-theitrain itse1f.

" For this purpose it has hitherto'beenusual to employ, short-circuitingdevices which,

1 however, are associated with variousdisadvantages. -The short-circuiting'system, due

to the great strengths of current which are compensated, constitutes a source of extreme danger to the operator; I If a number of substations coupled together-supply current to the zone,which it is. desired to-disconnect, and

in addition both directions-of travel, i. e., the up and down rails,are connected by means of automatic devices, unnecessarily large zones, and inparticular also;the' opposite direct-ion track, will be deprived; of current .by the short=circuiting. ,Itmay; also-occur that in the case of relatively lon'g feed stretches the,

- automatic devices are'not ieleasedyas the re;

sistanceof the circuit formed by the contact a rail andthe, travellingrail Tislso great that the releasing current strength is notattained. f If short-circu'iting is effected in the vicinity of a sub-station, this inmanycases will lead to considerable damage'to the switch appa 1 rat-usand machines. In the-case of rotary rectifiers i flashing-over occurs and. the. recti,

. fiers tend towards backfiring, whereby the track may be rendered unusable for a-cone siderable length of time.

Now -,it is the ,object of the invention toovercome the disadvantages referredto, and

this in accordance With the invention is acmatic device on the track. For the purpose of forming a circuit with intcrmittentd). (l, which is superposed to the main D. O. circuit, a make and break device isiemploye'd,iwhich is operatedmanually or by means of a motor, and possesses a low periodicity, the same being mounted on the train or at a block section.- This make and break device is con nected between contact rail and travelling rail, i. e., is in series with the collecting bar of the sub-station. Each coupling station and each sub-station are furnished with-a transformer and a time relay'acting onthe corresponding track automatic device. The different time relays are set in such manner that at first the time relay of the coupling station responds and the longitudinal and cross coupling arrested, so that in this man. nor the error is localized to the one zone to be disconnected. Not until then does the time relay' move into -function, the same then act ing on the'feed switch of the sub-station. Due to the inductance of the rails, it is'desir able to select the periodicity of the intermittent D. G. at, say, 10-20. The invention will now be described more fully -with reference tothe' accompanying drawing, in which a form of embodiment by -way of example is shown in diagrammatical orm. Fig. 1 is a diagram of connectionspertaim ing to the sub-station.

Fig. 2 is adiagrammatic representation of the make and break device for. generating the intermittent D. C.

. Fig. 3 is a diagram of-connections for a double-line track with sub-stations and a coupling station.

Referring to the drawing, 1 is the dynamo of the D. C. power station, or the converter .of a substation respectively, which converter through-themcdium of the automatic device a and the track autcmatiedvie'e serves w #closes them'a ke and break'device" 21;"Upon actuation of the switch1'8 the switch 22'is closed, so *that the current flows fromth'eco'ntact rail '4 over the lead 23 and'th'e alternately opened and closed 'make and brake device 21' supply current to the contact rail 4, whereby the other pole *of .the dynamo is connected in the usual manner through the collecting bar 5 to the travelling rail 6. Between the track automatic device 3.and.the contact rail ing 8. he primary winding 7 is connected in series with the :dynamo. 1,: whilet'he secondary winding 8 is connected to a time relay -9. This time relay serves for connection of the two contacts 10 and 11, 'so that along the lead 12 the current proceedingffrom'thelocal' battery 14 is able topass via the disc-drop- -.indicatorboard 13 to the releasing-coil'l'fi-of the track automatic device '3. The core "1'6 of this coil is connected in such manner with the track automatic device 3 that upon closing the circuit over the contacts 10, 'llfthe track antomatic device is'actua'ted by'the'battery 14,-

whereby the'current is cut oft from-the contact rail. This'actuat-ion, according'to the -invention, is effected from thejtrainfitself, or

from a block section, andan arrangement is'employed such ample in Fig. 2. 7

Referring to Fig. '2, 17 designates a 1 *ba't- 'tery,"which" may also, in the case of the block 'section, be replaced *by a-lightingfwire connection. This battery'feeds via-a switch 18 as that shown by way'of 'e'xthe electric-motor 19, which by means of the lever mechanisinQO alternately opens and through an adjustable resistanceQ L back to the travelling rail 6. By' means "ofthis ar rangement the substation with the-dynamo 1 is compelled to "supply intermittentDgQ, 'which traverses 'the travel circuit-andpossibly superposes the 'D."C."for'nunning'the train. Since the transformer 7,' 8 is situated in the circuit the intermittent D; G. traversing the primary coil 7 causes a 'currentto be current impulses cause actuation of the time relay 9, so that after expiry of a certain period,- which may be setias desired, the two contacts 10, 11 of the local battery are closed, causing operation of'the track automatic de- 'vice 3. iThediscdro rindicator board 13indicates to the operator in the substation an intentional release emanating from the track,- so that *arrenewed actuation of the track switch does not take place. Normal-switching operations on 'thetrack have no influence on the apparatus according to the invention,

as these operations do-not"-endure for such length of time as to move the'tim'e frelay into its extreme position, i; e.;tocause the contacts chautomaticdevice. The same may be ap- 4 is a transformer (inductance) comprising a primar winding 7 and a secondary'gwind place of qperation by the electro-motor 19, a

hand-operating means with crank or the like may'ibe' employedtorm; anakes'ancl break device 21.

- "Fig. 3 shows the 'connection diagrani o f an electrically coupled =two rail'track. The two parallel tracks comprising the contact rails 1 and thetravelling' rafls 6 are designated by a and b, withffadjacent zone'a and 'b coupled by means of .'the coupling station K and =fed'by the next sub-station. U and U z'are the two'fifeed systems of I a sub-station for the two 'difierent directions of travel. The sub-'stationflfor the *next zone or section (1 ,6 fiscorinected in the same irnanner. In the coupling-station, in 'the' s'ame manner *as described above in connection wit-h the sub-station, is -a- 'transformer' 'consi'sting of the primary iwinding' 'Z and"th'e'=secondary winding 8;

This transformer operates together with the time relay't9 exactlyes in the case of the substation; 'lhe"=time relay'serves for actuation of the three track switches 3?, 3", 3 shown .in Figs-3; Tliese t rackswitches serve the e a purpose off both'eonnecting thezones a and b,

:or a and' b respectively,ije., cross coupling, as 'wei'las connecting-the zones a, (1 or b, b respectively; "'e.-,' lo'n'gi'tudinal coupling. e'l -he actual'mason for this coupling. is diminfishfldiiditip iin voltage and better compensa- :..i Thebperation'iasregards the diagram of connections sh'o wn in'fllig, -3"is as follows: Itsms assumedf that atrain *witliin'the zone a ,znid ted by the contactrail land the travellling rail 'fimctuatesthedevice shown in Fig. 2.: Srnce allftrack smitches in the sub-stations rand in' the gcouplingstations are closed, the

. intermittent D. Gz flows into' the transform- -iers 8 er 7 8 respectively and acts upon thertime relay (if-9} respectively. The time lrelay Qef a c npling station is, for example, set infisuclwnianfierthata'fter a period of #5fseconds the same closesthe relay current for switeliing afi the track switches 3 3", 3, while thetimeqrelays in'thesub stations U U do not perform thesameoperation until after a period of 7*se'conds 'T-he 'result isflthat in this manner-at first 'the longitudinal and cross "coupling of the zones is arrested, viz., above a-ll the zon'e within whichthe'train is situated wil-Lbe' i olated,- i. e. the train causing the :sub station to'supply intermittent D. C. Not until then will theappertaining sub-station 1 switchbe' actuated. ln this 'manner the error will be localized to the Zone which requires tobedisconnected. 1 I

"It 1 be *u'ndersteod"that the above descripti-an mereiy given byway of example,

and that various modifications may be made without departing from the spirit of the invention.

What I claim as new and desire to secure by Letters Patent is:

1. In a method of electrically disconnecting at a distance track zones in the case of D. C. railways from a moving train or from a block section, the provision of means whereby actuation as desired of a device provided on the train or at the block section will compel the sub-station to supply intermittent D. C. in the feed circuit, the said intermittent D. C. by the use of a transformer and a time relay serving to actuate one or more automatic devices on the track.

2. In a method of electrically disconnecting at a distance track zones in the case of D. C. railways, from a moving train or from a block section, the provision of a transformer, the primar coil of which is in series with the contact rai while the secondary coil is connected to a time relay, and automatic devices on the track which, with the assistance of a local battery, are actuated b the said time relay.

3. In a method 0 electrically disconnecting at a distance track zones in the case of D. C. railways, from a moving train or from a block section, the provision at each coupling station and each sub-station of a transformer and a time relay, which latter actuates the appertaining track automatic device and is set in such manner that at first the relay of the coupling station operates for the purpose of interrupting the longitudinal and cross coupling, which operation is followed by response on the part of the relay which actuates the feed switch of the sub-station pertaining to the particular track zone in question.

4. In a form of embodiment of an arrangement for electrically disconnecting at a distance, from a train or block section, track zones in the case of D. C. railway systems wherein the track is divided into zones or sections, which are coupled together by means of coupling stations and are each fed separately by sub-power stations, a make and break device on the train or at a block section causing the sub-station pertaining to the zone wherein the train is located or to which the block section appertains to feed intermittent D. G. into the feed circuit for the train, automatic devices on the track, a transformer at the substati0n having its primary winding in series with the contact rail and its secondary winding connected to a time relay, and a local battery actuating the said automatic devices, all for the purpose of isolating the particular zone in the case of emergency or requirement.

In testimony whereof I have aflixed my signature.-

ULRICH KLOSS. 

